Paleosol (organic matter and pedogenic carbonates) and paleontological δ13C records applied to the paleoecology of late Pleistocene–Holocene in Mexico

摘要: Abstract Stable isotopes of carbon (δ 13 C) in terrestrial geological materials (paleosol humus and carbonates) as well fossil bones (collagen tooth enamel) are established highly specific records on paleoenvironmental characteristics. It was assumed that comparing the results different types regional or local scales provides more accurate reliable reconstructions even opens new aspects interpretation. This tested by comparison data obtained from late Pleistocene paleosols and/or remains megafauna various locations Northwestern Mexico: Sonora (paleosols formed MIS3, MIS2 MIS1); Central-Northern San Luis Potosi (teeth, corresponding to Central-Southern Puebla MIS3 MIS2, teeth associated with these paleosols), State Mexico MIS2). The isotopic studies complemented other proxies. δ C values is −19.8 to −16.95‰ organic matter, shows little difference between Holocene soils; pedogenic carbonates are −6.4 to −4.52‰. In Potosi, paleosol are −12.16‰ matter. Puebla, they vary from −24.6‰ to −15.16‰ modern surface soil, pointing contrasting vegetation change. fossils range from −10.7 1.2‰ SLP; of −2.73 and −2.93‰ Puebla; and −6.5 to −1.3‰ Mexico. analysis Northwest matched each other, indicating mixed C3–C4 vegetation; while for Mexico, indicated predominance C3 plants composition. general, indicate northern environmental conditions were slightly wetter than at present, central area there a large change high humidity trend drier climates MIS1.